@groupielove

The A20 being a much heavier car would be more stable and comfortable at higher speeds, the car has a CVT transmission which does not have the high engine revs and associated gear shifts or jerks which gives a driver the feeling of power and acceleration with a normal AT. There have also been some issues with the earlier D4 engine in the premio but the later unit in allion is an improved one but still requires diligence in maintenance. The a18's smaller but reliable engine gives still gives a respectable power output in comparison and with the normal AT would give better response and still offer good stability and handling.

Thus in my opinion I would go for the 1800cc model which gives a good balance of power, responsiveness, fuel economy, known engine reliability and stability on the road.

For first edition (2001-2007) The weight difference between A18 and A20 is 70kg. Approx 1 person :D

As far as I know, the 2L first edition (2001-2007) Allion/Premio engine is coupled with CVT, and for the second edition (2007+) all three engines are coupled with CVT.

http://en.wikipedia.org/wiki/Toyota_Allion
http://en.wikipedia.org/wiki/Toyota_Premio